<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 200px;
            height: 200px;
            margin: auto;
        }
        
        .box1 {
            box-shadow: 10px 10px 20px 10px green;
            text-shadow: 10px 10px 10px blue;
            background-color: orange;
        }
        
        .box2 {
            background-color: pink;
            /* width: 300px;
            height: 400px; */
            margin-top: 40px;
            border-radius: 50px 70px 90px 110px;
            /* border-radius: 50%; */
        }
        
        .box3 {
            width: 800px;
            height: 400px;
            background: yellow url(img/7.jpg) no-repeat;
            /* background-size: 600px 400px;
            background-size: cover; */
        }
    </style>
</head>

<body>
    <div class="box box1">
        这是一段文字
    </div>
    <div class="box box2">

    </div>
    <div class="box box3"></div>
</body>

</html>